From gold heist to murder - the unsolved case of John 'Goldfinger' Palmer

John 'Goldfinger' Palmer, known for the Brink's-Mat robbery, was gunned down in 2015 at his Essex estate. Initially mistaken as a natural death, a murder investigation ensued six days later. Suspected to be a professional hit, the case remains unsolved a decade after his death, with police highlighting the challenges of gathering evidence in contract killings.